Index of All Pets: A-Z

Pet Battle: Operation: Mechagon (Dungeon)

Drop: Hallowfall Sparkfly

Zone: Hallowfall

Drop Rate: 1 in 1

Achievement: Finally At Rest

Category: Dragonflight

Achievement: Raiding with Leashes VI: Pets of Pandaria

Category: Collect

Special Event: Plunderstorm

Faction: Keg Leg's Crew (Renown Six)

Drop: Sulfuron Harbinger [??+]

Zone: Molten Core

Approximate Drop Rate: 1 in 20

Pet Battle: [1-2] Durotar; [7-8] Arathi Highlands; [11-12] The Hinterlands

Vendor: Mistweaver Ku

Zone: Timeless Isle

Faction: Emperor Shaohao - Revered

Cost: 7500 (unlimited supply)

Pet Battle: [3-4] Northern Barrens

Drop: Demon Boss

Zone: Dreadscar Rift (Warlock Order Hall), The Fel Hammer (Demon Hunter Order Hall)

Approximate Drop Rate: Unknown

Vendor: Auction House

Vendor: Shylenai

Zone: Teldrassil

Cost: 50 (unlimited supply)

Achievement: Master of Minions

Category: Collect

World Event: Love is in the Air

Vendor: Lovely Merchant

Cost: 40 (unlimited supply)

Quest: How to Catch a Glimmerfly [60]

Zone: Bastion

Pet Battle: [25] Vol'dun; [25] Stormsong Valley; [25] Boralus; [25] Tiragarde Sound

Pet Battle: [6-7] Wetlands; [23-24] Twilight Highlands

Pet Battle: [23-24] Twilight Highlands

Pet Battle: [23-24] Twilight Highlands

Trading Card Game: Heroes of Azeroth

Pet Battle: [25] Nazjatar

Zone: Torghast

Approximate Drop Rate: Unknown

Pet Battle: [25] Highmountain

Achievement: That's Whack!

Category: Darkmoon Faire

Pet Battle: [25] Zaralek Cavern

Pet Battle: [25] Stormsong Valley

Vendor: Quartermaster Huseng

Zone: Ohn'ahran Plains

Faction: Maruuk Centaur (Renown Eight)

Cost: 5 20 150 (unlimited supply)

Pet Store 

Achievement: Ling-Ting's Herbal Journey

Category: Pandaria Dungeon

Quest: Blown Away [10]

Zone: Orgrimmar

PvP: Honor Reward

Requires: Honor Level 20

Pet Battle: [23-24] Uldum

Pet Battle: [7-9] Desolace; [25] Tanaan Jungle

World Event: Darkmoon Faire (first week of each month)

Vendor: Carl Goodup

Zone: Darkmoon Island

Cost: 90 (unlimited supply)

Pet Battle: [6-7] Hillsbrad Foothills; [10-11] Western Plaguelands; [14-15] Swamp of Sorrows; [22-23] Zul'Drak; [23-24] Twilight Highlands

Quest: DANGER: Kosumoth the Hungering [45]

Zone: Eye of Azshara

Drop: Wild Hunt Supplies

Zone: Ardenweald

Approximate Drop Rate: Unknown

Drop: World Drop

Zone: Northern Stranglethorn [10-30], The Cape of Stranglethorn [10-30]

Approximate Drop Rate: 1 in 8,000

Drop: Varasha's Egg

Zone: Spires of Arak [30-40]

Drop Rate: 1 in 1

Drop: Hydrath [50+]

Zone: Darkshore Warfront

Approximate Drop Rate: Unknown

Vendor: Varlan Highbough

Zone: Molten Front

Cost: 1500 (unlimited supply)

Drop: Archimonde [??+]

Zone: Hyjal Summit

Approximate Drop Rate: 1 in 25